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- Committer: Teddy Hogeborn
- Date: 2008-08-31 16:04:47 UTC
- mfrom: (24.1.77 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080831160447-2xte5k90onspphki
Merge.
added
removed
plugin-runner.c
96
96
97
97
static plugin *plugin_list = NULL;
98
98
99
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
100
100
or if none is found, creates a new one */
101
101
static plugin *getplugin(char *name){
102
102
/* Check for exiting plugin with that name */
118
118
return NULL;
119
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}
120
120
}
121
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122
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*new_plugin = (plugin) { .name = copy_name,
123
123
.argc = 1,
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.disabled = false,
132
132
}
133
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new_plugin->argv[0] = copy_name;
134
134
new_plugin->argv[1] = NULL;
135
135
136
136
new_plugin->environ = malloc(sizeof(char *));
137
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if(new_plugin->environ == NULL){
138
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free(copy_name);
141
141
return NULL;
142
142
}
143
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new_plugin->environ[0] = NULL;
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/* Append the new plugin to the list */
146
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plugin_list = new_plugin;
147
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return new_plugin;
179
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}
180
180
181
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/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
182
static bool add_environment(plugin *p, const char *def){
183
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if(p == NULL){
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return false;
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}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
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/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
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strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
186
return add_to_char_array(def, &(p->environ), &(p->envc));
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187
}
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188
238
221
/* No child processes */
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222
break;
240
223
}
241
224
242
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/* A child exited, find it in process_list */
243
226
while(proc != NULL and proc->pid != pid){
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227
proc = proc->next;
344
327
{ .name = "global-options", .key = 'g',
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328
.arg = "OPTION[,OPTION[,...]]",
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.doc = "Options passed to all plugins" },
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{ .name = "global-env", .key = 'G',
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{ .name = "global-envs", .key = 'e',
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.arg = "VAR=value",
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.doc = "Environment variable passed to all plugins" },
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{ .name = "options-for", .key = 'o',
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.arg = "PLUGIN:OPTION[,OPTION[,...]]",
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.doc = "Options passed only to specified plugin" },
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{ .name = "env-for", .key = 'E',
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{ .name = "envs-for", .key = 'f',
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.arg = "PLUGIN:ENV=value",
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.doc = "Environment variable passed to specified plugin" },
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{ .name = "disable", .key = 'd',
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.arg = "PLUGIN",
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.doc = "Disable a specific plugin", .group = 1 },
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{ .name = "enable", .key = 'e',
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.arg = "PLUGIN",
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.doc = "Enable a specific plugin", .group = 1 },
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{ .name = "plugin-dir", .key = 128,
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.arg = "DIRECTORY",
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.doc = "Specify a different plugin directory", .group = 2 },
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{ .name = NULL }
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};
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error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
359
error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {
360
/* Get the INPUT argument from `argp_parse', which we know is a
361
pointer to our plugin list pointer. */
381
362
switch (key) {
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case 'g': /* --global-options */
383
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if (arg != NULL){
393
374
}
394
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}
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break;
396
case 'G': /* --global-env */
377
case 'e': /* --global-envs */
397
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if(arg == NULL){
398
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break;
399
380
}
402
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if(envdef == NULL){
403
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break;
404
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}
405
if(not add_environment(getplugin(NULL), envdef, true)){
386
if(not add_environment(getplugin(NULL), envdef)){
406
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perror("add_environment");
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}
408
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}
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case 'o': /* --options-for */
411
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if (arg != NULL){
412
393
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0' or arg == NULL){
394
if(p_name[0] == '\0'){
414
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break;
415
396
}
416
397
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0' or opt == NULL){
398
if(opt[0] == '\0'){
418
399
break;
419
400
}
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
401
if(opt != NULL){
402
char *p;
403
while((p = strsep(&opt, ",")) != NULL){
404
if(p[0] == '\0'){
405
continue;
406
}
407
if(not add_argument(getplugin(p_name), p)){
408
perror("add_argument");
409
return ARGP_ERR_UNKNOWN;
410
}
428
411
}
429
412
}
430
413
}
431
414
break;
432
case 'E': /* --env-for */
415
case 'f': /* --envs-for */
433
416
if(arg == NULL){
434
417
break;
435
418
}
443
426
break;
444
427
}
445
428
envdef++;
446
if(not add_environment(getplugin(p_name), envdef, true)){
429
if(not add_environment(getplugin(p_name), envdef)){
447
430
perror("add_environment");
448
431
}
449
432
}
457
440
p->disabled = true;
458
441
}
459
442
break;
460
case 'e': /* --enable */
461
if (arg != NULL){
462
plugin *p = getplugin(arg);
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
465
}
466
p->disabled = false;
467
}
468
break;
469
443
case 128: /* --plugin-dir */
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plugindir = strdup(arg);
471
445
if(plugindir == NULL){
473
447
}
474
448
break;
475
449
case 129: /* --config-file */
476
/* This is already done by parse_opt_config_file() */
477
break;
450
argfile = strdup(arg);
451
if(argfile == NULL){
452
perror("strdup");
453
}
454
break;
478
455
case 130: /* --userid */
479
456
uid = (uid_t)strtol(arg, NULL, 10);
480
457
break;
495
472
return 0;
496
473
}
497
474
498
/* This option parser is the same as parse_opt() above, except it
499
ignores everything but the --config-file option. */
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
504
case 'g': /* --global-options */
505
case 'G': /* --global-env */
506
case 'o': /* --options-for */
507
case 'E': /* --env-for */
508
case 'd': /* --disable */
509
case 'e': /* --enable */
510
case 128: /* --plugin-dir */
511
break;
512
case 129: /* --config-file */
513
argfile = strdup(arg);
514
if(argfile == NULL){
515
perror("strdup");
516
}
517
break;
518
case 130: /* --userid */
519
case 131: /* --groupid */
520
case 132: /* --debug */
521
case ARGP_KEY_ARG:
522
case ARGP_KEY_END:
523
break;
524
default:
525
return ARGP_ERR_UNKNOWN;
526
}
527
return 0;
528
}
529
530
struct argp argp = { .options = options,
531
.parser = parse_opt_config_file,
532
.args_doc = "",
475
struct argp argp = { .options = options, .parser = parse_opt,
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
533
477
.doc = "Mandos plugin runner -- Run plugins" };
534
478
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/* Parse using the parse_opt_config_file in order to get the custom
536
config file location, if any. */
537
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
538
480
if (ret == ARGP_ERR_UNKNOWN){
539
481
fprintf(stderr, "Unknown error while parsing arguments\n");
540
482
exitstatus = EXIT_FAILURE;
541
483
goto fallback;
542
484
}
543
544
/* Reset to the normal argument parser */
545
argp.parser = parse_opt;
546
547
/* Open the configfile if available */
485
486
/* Opens the configfile if aviable */
548
487
if (argfile == NULL){
549
488
conffp = fopen(AFILE, "r");
550
489
} else {
568
507
custom_argv[0] = argv[0];
569
508
custom_argv[1] = NULL;
570
509
571
/* for each line in the config file, strip whitespace and ignore
572
commented text */
510
/* for each line in the config file, strip whitespace and ignore commented text */
573
511
while(true){
574
512
sret = getline(&org_line, &size, conffp);
575
513
if(sret == -1){
604
542
}
605
543
}
606
544
free(org_line);
607
} else {
545
} else{
608
546
/* Check for harmful errors and go to fallback. Other errors might
609
547
not affect opening plugins */
610
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
616
554
/* If there was any arguments from configuration file,
617
555
pass them to parser as command arguments */
618
556
if(custom_argv != NULL){
619
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
620
0, NULL);
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
621
558
if (ret == ARGP_ERR_UNKNOWN){
622
559
fprintf(stderr, "Unknown error while parsing arguments\n");
623
560
exitstatus = EXIT_FAILURE;
625
562
}
626
563
}
627
564
628
/* Parse actual command line arguments, to let them override the
629
config file */
630
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
631
if (ret == ARGP_ERR_UNKNOWN){
632
fprintf(stderr, "Unknown error while parsing arguments\n");
633
exitstatus = EXIT_FAILURE;
634
goto fallback;
635
}
636
637
565
if(debug){
638
566
for(plugin *p = plugin_list; p != NULL; p=p->next){
639
567
fprintf(stderr, "Plugin: %s has %d arguments\n",
647
575
}
648
576
}
649
577
}
650
578
651
579
/* Strip permissions down to nobody */
652
580
ret = setuid(uid);
653
581
if (ret == -1){
657
585
if (ret == -1){
658
586
perror("setgid");
659
587
}
660
588
661
589
if (plugindir == NULL){
662
590
dir = opendir(PDIR);
663
591
} else {
684
612
}
685
613
686
614
FD_ZERO(&rfds_all);
687
615
688
616
/* Read and execute any executable in the plugin directory*/
689
617
while(true){
690
618
dirst = readdir(dir);
691
619
692
/* All directory entries have been processed */
620
// All directory entries have been processed
693
621
if(dirst == NULL){
694
622
if (errno == EBADF){
695
623
perror("readdir");
701
629
702
630
d_name_len = strlen(dirst->d_name);
703
631
704
/* Ignore dotfiles, backup files and other junk */
632
// Ignore dotfiles, backup files and other junk
705
633
{
706
634
bool bad_name = false;
707
635
793
721
}
794
722
/* Add global environment variables */
795
723
for(char **e = g->environ; *e != NULL; e++){
796
if(not add_environment(p, *e, false)){
724
if(not add_environment(p, *e)){
797
725
perror("add_environment");
798
726
}
799
727
}
804
732
process, too. */
805
733
if(p->environ[0] != NULL){
806
734
for(char **e = environ; *e != NULL; e++){
807
if(not add_environment(p, *e, false)){
735
char *copy = strdup(*e);
736
if(copy == NULL){
737
perror("strdup");
738
continue;
739
}
740
if(not add_environment(p, copy)){
808
741
perror("add_environment");
809
742
}
810
743
}
837
770
exitstatus = EXIT_FAILURE;
838
771
goto fallback;
839
772
}
840
/* Starting a new process to be watched */
773
// Starting a new process to be watched
841
774
pid_t pid = fork();
842
775
if(pid == -1){
843
776
perror("fork");
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